Hyperreal numbers: infinities and infinitesimals - "In 1976, Jerome Keisler, a student of the famous logician Tarski, published this elementary textbook that teaches calculus using hyperreal numbers. Now it's free, with a Creative Commons copyright!" (pdf—25mb :) [more inside]
The simulated brain - "First computer model to produce complex behaviour performs almost as well as humans at simple number tasks." [1,2,3,4,5,etc.]
Science Hack is a unique search engine for science videos focusing on Physics, Chemistry, and Space. For example, things to do with sulfur hexafluoride. Still growing, the editors are presently indexing other scientific fields of study including Geology, Psychology, Robotics and Computers. Ever wonder why things go bang?
Three columns on technology and eduction by Robert Cringely: the clash between those who grew up with computers and those who didn't in War of the Worlds, Amish Paradise looks for learning models in unexpected places and Ozzy knows best talks about how important digital games, not video games, could be to education. [more inside]
Two months from illiterate to MP3 trading hax0rz. Very cool social experiment showing how easy today's GUIs are to use, especially for kids.